Fabrik-deutz



(No Model.) N A OTTO 2 Sheets-Sheet 1.

GAS OR OIL MOTOR ENGINE.

No. 433,810. Patented Aug. 5, 1890.

(No Model.) 2 Sheets-Sheet 2.

N. A. OTTO.

GAS 0R OIL MOTOR ENGINE.

No. 433,810. Patented Aug.'5, 1890. A

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UNITED STATES PATENT OFFICE;

NICOLAUS AUGUST OTTO, OF COLOGNE, ASSIGNOR TO THE GAS-MOTOREN- FABRIK-DEUTZ, OF KULN-DEUTZ, GERMANY.

GAS or: on. MOTOR ENGINE.

SPECIFICATION forming part of Letters Patent No. 433,810, dated August 5, 1890.

Application filed April 21, 1890. Serial No. 348,895. (No model.) Patented in Belgium April 5, 1890, No. 90,095, and in Italy April 29, 1890,3LIII, 332- i To a whom it may concern.-

Be it known that I, NIOOLAUS AUeUsr O'rro, a citizen of Prussia, residing at Cologne, in the German Empire, have invented new and useful Improvements in Gas or Oil Motor Engines, (for which I have obtained Letters Patent in Belgium, dated April 5, 1890, No. 90,095, and in Italy, dated April 29, 1890, Vol. LIII, 332,) of which the following is a specification.

This invention relates to gas or oil motor engines working with a cycle of four strokes, and has for its object to provide novel and simple means for operating the dischargevalve without the employment of a countershaft driven through toothed gearing from the engine-shaft at half the speed of the latter. If the movement of the discharge-valve of the cylinder were effected by the engineshaft or by a counter-shaft revolving at the same speed without special appliances, the discharge-valve would be opened both during the discharging-stroke and during the compressing-stroke.

In order to maintain the discharge-valve closed during the compressing-stroke according to the present invention, a suitable apparatus is made to act upon the discharge-valve gear at the proper time by the action of the rarefaction produced in the cylinder during the suction-stroke. I will proceed to describe an arrangement of apparatus for carrying out thismethod of operating with reference to the accompanying drawings, in which- Figure 1 shows a longitudinal section of a motor-engine with one arrangement of the said apparatus applied thereto. Fig. 2 shows a diagram of the crank and eccentric motion. Fig. 3 shows a view of the valve-gear in a different position. Figs. 4 and 5 are details of the gas and air admission apparatus, and Fig.

6 shows a modification.

The crank-shaft of the engine, Fig. 1, has an eccentric a or a crank, which is placed at an angle of ninety degrees to the enginecrank, as at Fig. 2, and from which, by means of a rod 1), an igniting-slide z is actuated. The igniting device is here assumed to be a heated tube; but any other known igniting device may be used. A double-ended lever d is connected at its one end by a link 0 to the slide 2, so as to have a to-and-fro motion imparted to it thereby, and to the other end of the lever is pivoted a rod or pawl e.

According to the position given to this rod it will either be stem when brought into the position shown at Fig. 3, and thus allow the Valve to remain closed.

This shifting of the rod 8 is effected in the present case by the apparatus g, con-.

sisting of a hollowvessel or cup closed by an elastic or flexible diaphragm h, which is connected by a link i to the rod e. The cup 9 is made to communicate by a pipe k with the air-supply at is, Fig. 5, or with the gas-pipe at k.

The apparatus operates as follows: Assuming the engine to be in regular working, the gas-Valve Z being either opened by a known governor arrangement at each forward motion of the piston or being always in the open position and onlyclosed when no explosive mixture is to be drawn into the cylinder, the admission of gas and air to thecylinder is controlled by the valve 22 in the well-known manner.

At Fig. 4 of the drawings is shownaknown form of inertia governor for the purpose of acting on the gas-valve, the governor being carried by and moving with the ignitingslide a.

WVhen an explosive charge is drawn into the cylinder by the forward motion of the piston, there will exist in the cylinder and in the gas and air supply pipes a pressure below, that of the atmosphere, and this reduced pressure will be transmitted through pipe in to the cup g. In consequence hereof the diaphragm hwill be moved inward by the excess of external atmospheric pressure, and the rod 6 will be drawn thereby into the position shown at Fig. 3. On the following inward motion of the piston, during. which the slide 2 will be moved to the left hand, the rod 6, in moving forward with the end of the lever, will consequently miss the stem of the valve f and will move past the same, as indicated Consequently the discharge-valve will remain closed and the cylinder-charge will be compressed. At the following" forward stroke of the piston the explosion and expansion of the gases will take place. At the ensuing inward stroke the slide z will again move to the left hand. In the meantime the pressure within the cup 9 will have become equal to the atmosphere, so that the spring 072, which acts upon the rod e, will draw the latter back into the position shown at Fig. 1, so that on the forward motion of the lever d the rod 6 will force open the discharge-valve.

The above-described action will be repeated at every cycle of four strokes.

Instead .of the arrangement of cup with flexible diaphragm shown at Fig. 1, it will be evident that any equivalent thereof may .be used-such as a small cylinder with piston p fitted on the air-supply pipe-as shown at Fig. 6. The rod e can also be actuated by means of an inlet-valve or mixing-valve.

If the pipe 70 of the'apparatus g is connected with the air-supply pipe k or gas-supply pipe is, then every time that only air is drawn into the cylinder instead of an explosive mixture the diaphragm It will come into action and keep the dischargevalve closed. The known mode of regulating the speed of the engine will then take place, whereby only air is drawn in, instead of explosive mixture, is compressed and expanded, and is then discharged.

I do not lferein claim utilizing the variations of pressure produced either in the gas and air supply pipes or in the engine-cylinder during the several strokes of the piston for acting upon mechanism connected with the discharge-valve in such manner that this valve is caused to remain closed during the compressing-instroke and to be opened during the expelling-instroke, as such method constitutes thesubject-matter of myapplicationfiledApril 21, 1890, Serial No. 348,894; nor do I claim the combination, with the discharge-valve of the engine, of a rocking lever receiving reciprocating motion from a crank or eccentric on the engine-shaft, a pivoted rod on such lever acted upon by a spring tending to keep the rod out of line with the discharge-valve stem, and a small cylinder and piston or equivalent device subject to the variations of pressure in the engine-cylinder, such piston or equivalent device being connected with the pivoted rod on the rocking lever, so that when the small piston is subject to the pressure in the enginecylinder during the compressing or working stroke of the engine-piston it acts on the pivoted rod so as to bring it in line with the discharge-valve stem and cause it to open the valve during the expelling-stroke of the piston, as such constitutes the subject-matter of my application filed April 21, 1890, Serial No. 348,896.

Having thus described the nature of my invention and the best means I know for carrying the same into practical effect, I claim- In a four-stroke-cycle gas or oil motor engine, the combination, with the dischargevalve of the engine, of a rocking lever receiving reciprocating motion from a crank or eccentric on the engine-shaft, a pivoted rod on such lever acted upon by a spring tending to keep the rod in line with the discharge-valve stem, so as to force this open during the compressing-stroke of the piston, and a cup and diaphragm. or equivalent device subject to the variations of pressure in the gas or air supply pipes, such diaphragm or equivalent device being connected with the piv'oted rod on the rocking lever, so that when the diaphragm is subject to a pressure below that of the atmosphere during the suction-stroke of the piston it acts on the pivoted rod so as to prevent it from opening the discharge-valve, substantially as herein described.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this 3d day of April, A. D. 1890.

NICOLAUS AUGUST OTTO.

WVitnesses:

PET. LANGEN, WILH. SPIECKER. 

